Twenty-five people were killed when a passenger bus plunged into a ravine on Indonesia's Sumatra island after its brakes apparently malfunctioned, police said Tuesday.

At least 14 other people were hospitalized with injuries following the crash, including one in critical condition with bone fractures, said local police chief Dolly Gumara. The crash occurred just before midnight Monday on a winding slope in South Sumatra province's Pagaralam district.

Gumara said the bus plunged into a 80-meter (262-foot) -deep ravine and crashed into a fast-flowing river after the driver lost control of the vehicle in an area with a number of sharp inclines.

The bus was headed for the provincial capital of Palembang from the neighboring city of Bengkulu.